Remove duplicated code in EVP.

Second phase of EVP cipher overhaul.

Change functions like EVP_EncryptUpdate() so they now return a
value. These normally have software only implementations
which cannot fail so this was acceptable. However ciphers
can be implemented in hardware and these could return errors.

Beginnings of EVP cipher overhaul. This should eventually
enhance and tidy up the EVP interface.

This patch adds initial support for variable length ciphers
and changes S/MIME code to use this.

Some other library functions need modifying to support use
of modified cipher parameters.

Also need to change all the cipher functions that should
return error codes, but currenly don't.

And of course it needs extensive testing...

Call dh_tmp_cb with correct 'is_export' flag.

Avoid tabs in CHANGES.

ASN1 encoding.

Submitted by: Arnaud De Timmerman <Arnaud.De.Timmerman@branchur.fr>

Contributed by SAKAI Kiyotaka <ksakai@kso.netwk.ntt-at.co.jp>

to adhere to are listed.  It should be regarded as a complement to
whatever is out on the web, including the docs in http://www.openssl.org/

Submitted by: Zeroknowledge

This is superfluous now that we don't have to avoid creating
multiple versions of the file on VMS (because older versions
are now deleted).

decided to provide an alternative...